在冬眠动物的体内也较多。在寒冷的环境下，棕色脂肪细胞内的脂类迅速氧化，产生大量热能，有利于新生儿的抗寒和维持冬眠动物的体温。网状组织（reticular tissue）是由网状细胞、网状纤维和基质组成。1．网状细胞（reticular cell）为星形多突起细胞，其突起彼此连接成网。胞质弱嗜碱性。核较大、椭圆形、染色浅、核仁清楚。2．网状纤维网状纤维细而多分支，沿着网状细胞的胞体和突起分布（即网状细胞附于其上）。网状纤维分支互相连接成的网孔内充满基质（在淋巴器官和造血器官分别是淋巴液和血液）。体内没有单独存在的网状组织，它是构成淋巴组织、淋巴器官和造血器官的基本组成成分。分布于消化道、呼吸道粘膜固有层、淋巴结、脾、扁桃体及红骨髓中。在这些器官中，网状组织成为支架，网孔中充满淋巴细胞和巨噬细胞，或者是发育不同阶段的各种血细胞。网状细胞则成为T、B淋巴细胞和血细胞发育微环境的细胞成分之一。成纤维细胞（fibroblast）是疏松结缔组织的主要细胞成分。细胞扁平，多突起，呈星状，胞质较丰富呈弱嗜3-3成纤维细胞左和纤维细胞右超微结构模式3-3成纤维细胞左和纤维细胞右超微结构模式碱性。胞核较大，扁卵圆形，染色质疏松着色浅，核仁明显（图3－2 ）。在电镜下，胞质内富于粗面内质网、游离核糖体和发达的细菌尔基复合体，表明细胞合成蛋白质功能旺盛（图3－3，3－4）。成纤维细胞既合成和分泌胶原蛋白，弹性蛋白，生成胶原纤维、网状纤维和弹性纤维，也合成和分泌糖胺多糖和糖蛋白等基质成分。成纤维细胞处于功能静止状态时，称为纤维细胞（fibrocyte）（图3 －3）。细胞变小，呈长梭形，胞核小，着色深，胞质内粗面内质网少、细菌尔基复合体不发达，嗜酸性。在一定条件下，如创伤修复，结缔再生时，纤维细胞又能再转变为成纤维细胞。同时，成纤维细胞也能分裂增生。成纤维细胞常通过基质糖蛋白的介导附着在胶原纤维上。
In hibernation animals are also more. In a cold environment, lipids in brown fat cells rapidly oxidize and produce large amounts of heat, which are good for the newborn's cold resistance and maintaining the body temperature of the hibernating animal. Reticular tissue is composed of reticular cells, reticular fibers and matrix. 1. Reticular cells are asteroid papillae, the projections of which are connected to each other in a network. Cytoplasmic weakly basophilic. Larger nuclei, oval, stained light, clear nucleolus. 2. Reticular fibers Reticular fibers are fine and branched, distributed along the cell body and projections of reticular cells (ie, reticulocytes attached thereto). Mesh fiber branches interconnected into the mesh filled with matrix (lymphoid organs and hematopoietic organs were lymph and blood, respectively). There is no separate reticular tissue, which constitutes the basic components of lymphoid tissues, lymphoid organs and hematopoietic organs. Distribution in the digestive tract, respiratory mucosal lamina propria, lymph nodes, spleen, tonsils and red bone marrow. In these organs, the reticular tissue becomes a scaffold, the mesh is filled with lymphocytes and macrophages, or various blood cells that develop at different stages. Reticular cells become one of the cellular constituents of T, B lymphocytes and the microenvironment of hematopoiesis. Fibroblasts are the major cellular components of loose connective tissue. Cells were flat, multi-protuberant, was star-shaped, more abundant cytoplasm was weak-addicted to 3-3 fibroblasts left and fibroblasts right ultrastructure mode 3-3 left fibroblasts and fibroblasts right ultrastructure mode alkaline. Larger nuclei, oval, chromatin loose pale, clear nucleoli (Figure 3-2). Under electron microscopy, the cytoplasm is rich in rough endoplasmic reticulum, free ribosomes, and well-established bacterial-based complexes, suggesting strong cellular protein synthesis (Figure 3-3, 3-4). Fibroblasts not only synthesize and secrete collagen, elastin, produce collagen fibers, reticular fibers and elastic fibers, but also synthesize and secrete glycosaminoglycans and glycoproteins and other matrix components. Fibroblasts in the quiescent state, called fibrocytes (fibrocytes) (Figure 3 -3). Cells become smaller, long fusiform, small nuclei, darker color, fewer endoplasmic reticulum cytoplasmic, bacterial basal complex is underdeveloped, eosinophilic. Under certain conditions, such as wound repair, connective tissue regeneration, fibroblasts can be transformed into fibroblasts. At the same time, fibroblasts can also divide and proliferate. Fibroblasts are often attached to collagen fibers mediated by matrix glycoproteins.

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